Semseyite
Mineral Pb9Sb8S21
Take care.
- Contains lead: Wash your hands after handling it, keep it away from children, and don't make dust.
- Toxic: Wash your hands after handling it, don't lick or taste it, and don't make dust.
About it
Lead-grey to black tabular crystals, often in rosettes and sheaves. Best known from Herja and Baia Sprie in Romania.
- Type
- Mineral
- Group
- Sulfosalt, plagionite group
- Formula
- Pb9Sb8S21
- Hardness (Mohs)
- 2.5
- Specific gravity
- 5.8–5.9
- Streak
- dark grey
- Lustre
- metallic
- Crystal system
- Monoclinic
- Colours
- dark lead grey, black
- Transparency
- opaque
- Cleavage and fracture
- perfect in one direction
Typical values: real specimens vary. For more, see mindat.org.